全文获取类型
收费全文 | 810篇 |
免费 | 23篇 |
专业分类
各国政治 | 20篇 |
工人农民 | 87篇 |
世界政治 | 65篇 |
外交国际关系 | 27篇 |
法律 | 388篇 |
中国政治 | 16篇 |
政治理论 | 213篇 |
综合类 | 17篇 |
出版年
2022年 | 7篇 |
2021年 | 2篇 |
2020年 | 11篇 |
2019年 | 12篇 |
2018年 | 18篇 |
2017年 | 14篇 |
2016年 | 27篇 |
2015年 | 17篇 |
2014年 | 19篇 |
2013年 | 105篇 |
2012年 | 34篇 |
2011年 | 25篇 |
2010年 | 24篇 |
2009年 | 11篇 |
2008年 | 32篇 |
2007年 | 35篇 |
2006年 | 39篇 |
2005年 | 42篇 |
2004年 | 35篇 |
2003年 | 29篇 |
2002年 | 31篇 |
2001年 | 16篇 |
2000年 | 17篇 |
1999年 | 9篇 |
1998年 | 12篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1995年 | 10篇 |
1994年 | 11篇 |
1993年 | 10篇 |
1992年 | 12篇 |
1991年 | 15篇 |
1990年 | 13篇 |
1989年 | 9篇 |
1988年 | 20篇 |
1987年 | 12篇 |
1986年 | 12篇 |
1985年 | 8篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 7篇 |
1979年 | 7篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1974年 | 3篇 |
1973年 | 2篇 |
排序方式: 共有833条查询结果,搜索用时 15 毫秒
711.
Shalhoub R Quinones I Ames C Multaney B Curtis S Seeboruth H Moore S Daniel B 《Forensic science international》2008,178(2-3):199-203
There are many techniques available for the recovery of fingermarks at scenes of crime including the possibility of taking casts of the marks. Casts can be advantageous in cases where other destructive recovery techniques might not be suitable, such as when recovering finger marks deposited on valued or immobile items. In this research, Isomark (a silicone-based casting material) was used to recover casts of finger marks placed on a variety of substrates. Casts were enhanced using cyanoacrylate fuming. Good quality marks were successfully recovered from a range of smooth, non-porous surfaces. Recovery from semi-porous surfaces was shown to be inefficient. DNA was subsequently extracted from the casts using QIAamp Mini extraction kits, amplified and profiled. Full DNA profiles were obtained 34% of samples extracted. 相似文献
712.
Aircraft designated for sport or recreational use only, including ultralights, experimental aircraft and light-sport aircraft, have become increasingly popular. Because of their relative safety and the rarity of fatalities resulting from crashes of these aircraft, the forensic literature contains little information concerning the pathologic findings in such deaths. We report 9 deaths resulting from 6 sport aircraft crashes in southwest Florida, 6 pilots and 3 passengers. The vehicles involved 3 experimental aircraft, 1 ultralight and 2 "ultralight-like" aircraft. The patterns of injuries included trauma predominantly to the chest (3 cases), abdomen (1) or head (1), as well as multiple blunt force injuries involving the chest and abdomen (1) or the head and torso (3). Extremity fractures were found in only 2 cases, whereas injuries to the symphysis pubis were found in six. No "control-type" injuries were identified. These cases illustrate the varied pathologies associated with deaths due to crashes of sport aircraft and reveal the lack of uniformity associated with the investigations of such deaths. 相似文献
713.
Nitrogen is an inert gas that is a normal constituent of the air that we breathe. It is a suffocating gas that does not support life and that can be a cause of death by the displacement of oxygen in the atmosphere. The majority of deaths associated with nitrogen have occurred in the setting of scuba diving. Although other suffocating gases have been used as a means of committing suicide, the literature contains little information about the use of nitrogen as a suicidal agent. A case of a 50-year-old man who committed suicide using a homemade suicide device and nitrogen gas is presented. 相似文献
714.
715.
716.
717.
718.
Joan E. Camara B. Nathaniel Carr Barbara L. Grota 《Journal of Legal Studies Education》2007,24(1):1-18
The principal focus of this study is an investigation of whether students' grade point average (GPA) is a viable criterion for forming student work groups in the undergraduate Legal Environment of Business course. More specifically, the research focuses on the impact of: (1) GPA-homogeneous (HO) and GPA-heterogeneous (HE) groups upon student satisfaction with group processes and (2) the impact on individual student performance in both group and nongroup assignments. Data obtained from fourteen HE and fourteen HO student groups, in four separate Legal Environment of Business classes consisting of a mix of Management, Marketing, Computer Information Systems, International Business, Financial Services, and Accounting majors, generated a number of significant results. The most surprising observations dealt with the behavior of low achievers whose individual grades showed substantial improvement after working in HO groups. Researchers who are assessing pedagogical methods which serve to engage a student's active learning and motivation should find these results to be of interest. In addition, the beneficial impact on task and relationship behaviors observed in this study should provide solace or a sense of reward to the larger set of academicians, across disciplines, who attempt to impart realistic organizational skills to their classes. 相似文献
719.
The likelihood of further criminal conduct is important in allocation decisions for parole supervision resources. In this article, the relationship between arrest-free time after release (alone and in combination with other variables) and the probability of subsequent arrest is examined for a relatively large random sample of released federal prisoners (N=1,806). A six-year follow-up period is made possible by the use of “rap sheet” records provided by the Federal Bureau of Investigation.Knowledge of this relationship may be used to provide empirical guidance for decisions about the intensity and/or duration of supervision; and a method for the practical application of this knowledge in case decision-making is illustrated. 相似文献
720.